Elevator.



No. 823,029. 'PATENTED AUG. 7, 1906. c. w. JACKSON.

ELEVATOR.

APPLICATION FILED NOV. 1, 1904.

Mama

1n: NORRIS PETERS co., wasmncmu, n. c.

UNITED STATES PATENT OFFICE}.

CHARLES W. J AGKSON, .OF SAN DIEGO, CALIFORNIA, ASSIGNOR OF ONE" HALFTO ISAAC A. LOTHIAN, ()1? LOS ANGELES, CALIFORNIA.

ELEVATOR} Specification of Letters Patent.

Patented Aug. '7, 1906.

Application filed November 1,1904. 7 Serial No. 230,893.

To (ZZZ whomit' may concern.-

Be it known that I, CHARLEs W. JACKSON, a citizen of the United States, residing. atSan Diego, county of San Diego, State of California, have invented certain new anduseful Improvements in Elevators, of which the following is a specification.

An important object of'this invention is to provide an elevator which will be continuously supported by the propelling or lifting and lowering means in such manner that there is no possibility of falling ofthe elevator in the shaft.

A further object of the invention in this connection is to provide this positive support and propelling means for the. elevator while maintaining a clear and unobstructed elevator-shaft.

A further object of the invention is to do away with all the susp ending-cables with their attendant risk of breakage.

Another object of the invention is-to do away with the necessity of using safety devices such as are required with the cables now in use.

Another object of the invention is to utilize the rails or tracks which serve asguides for the elevator-cage as part of the supporting and propelling means for the cage.

Another object of the invention is to dispense with the use of brakes.

Another object of the invention is to provide for convenient control of the propelling devices from the elevator-cage.

The accompanying drawings illustrate the invention.

Figure 1 is a horizontal section of the elevator-shaft and the lower part of the cage on line X X in Fig. 2. Fig. 2 is a vertical section on line X X in Fig. 1. Fig. 3 is a detail of the controlling and reversing gear. Fig. 4 is a detail horizontal section showing differ ent forms of the combined guide and screwrack. Fig. 5 is a diagram of the elevator connections for electric reverse and control.

1 designates an elevator shaft or well, and 2 a cage or car adapted to travel therein.

Suitably positioned in the shaft-for eX- ample, at each corner thereof-'are tracks or rails 3, which are provided on their inner faces with screw-racks 4, in which engage screw drums or members5, mounted on vertical axes or shafts 6 at the respective corners of the elevator-cage. The engagement of said screw-drums with the screw-racks 4 serves to'firmly support the cage in-the shaft against the action of gravity, as well as against any rotative action or any lateral displacement. The. screw-racks 4 are desirably concavedzon their inner. faces to enable more effectual engagement with the screwdrum's-5...

It will be seen thatby driving all of the screw-drums 5 from left to right they will .workdown on the screw-racks 6, thus lowerwhile by turning, said screwdrums in'the reverse direction'they will cause the cage to rise. To effect this, driving means is connected to said screw-drums, comprising: an electric motor. 7 supported'on axfalse bottom 8', which is suspended from the maincage 2 by studs 9, said bottom carrying. the lower bearings or steps 10 for the vertical shafts 6. aforesaid, the upper bearings 1 1 for said shaft being-carried on the bottom of the main cage 2. The several screwdrums 5 are connectedtogether by means of a sprocket-chain 12, running on sprocket- Wheels 13 on the shaft 6 ofthe respective screw-drums, said sprocket-chain also run ning over a sprocket-wheel 14: on a vertical shaft 15, journaled in bearings on the cage 2 and false bottom 8. Said shaft 15 is connected to be driven by the shaft 16 of the motor 7 through a reversing-gear, (indicated at 17.) This reversing-gear may be controlled by a lever 18, which may also control a rheostat 19 for motor 7 to control the speed and give an easy start. I

20 designates the flexible supply-cable ing; the. cage,

which is suspended in the elevator-shaft and from which connection is made to switch lever 18 and then to motor 7. The handle of controller-lever 18 extends up into the cage.

If electric reverse is desired, the connections may be made as in Fi 5, where 21 designates a reversing contro ler-switch, reversing the connections to armature 22 of motor 7 and also throwing in circuit more or less of the resistances 23 to control the speed. 28 designates the main circuit-switch for the motor.

Means may be provided for guiding the cage independently of the engagement of screw members 5 with screw-racks 4. Thus, as shown in Fig. 4, guide-wheels may be provided mounted on brackets 26 on the cage and engaging in track-grooves 27 in the vertical rails or rods 3.

The supporting screw-racks being located in fixed positions exteriorly of the cage between the cage and the sides or corners of the elevator-shaft, no more room is taken up than with an ordinary elevator and the elevator-shaft will be left clean and unob structed.

In running the elevator the controller or handle will be moved one way or the other, according to whether it is desired to ascend or descend, and in either case the driving means will be. brought into operation to rotate all the screw-drums simultaneously, thereby causing the move up or down in the shaft, as the may be. When it is desired to stop, the handle is thrown to the middle position, thereby stopping the operation of the driving means.

Any number of screw-racks and engaging screw members may be provided, and the construction may be otherwise modified without departing from my invention.

What I claim is 1. In an elevator, the combination of a plurality of tracks extending longitudinally of the elevator-shaft and provided with screw-racks, driving means, an elevator-cage provided with screw members rotating on vertical axes and engaging said racks, achain connected to rotate all of said screw members simultaneously, a false bottom for said cage to continuously case 5 plurality of tracks extending longitudinally l of the elevator-shaft and provided with l screw-racks, a cage mounted to travel bef tween said tracks, vertical axes at the respective corners of the cage, screw members I mounted on said vertical axes on said cage and engaging said vertical tracks, sprocket- 'wheels connected to the respective screw l members, a sprocket-chain engaging said i sprocket-wheels, wheel-driving means en- 1 gaging said sprocket-chain, a motor connect- I ed to said wheel-driving means, a false bot- E tom beneaththe cage, and a motor carried l by said false bottom. 3. In an elevator, the combination of a plurality of tracks extending longitudinally of the elevator-shaft and provided with screwracks, an elevator-cage mounted to I travel between said tracks and having a false I bottom below the cage, studs for supporting said bottom, steps carried by said bot tom, screw members en aging the respective screw-racks, vertical shafts carrying said 1 screw members and journaled on the cage in I said steps andi on the false bottom, an electric motor mounted on the. false bottom, driving connections between said motor and J the screw members, flexible supply conneci tions for the electric motor, a controller havf ing a handle in the cage, and reversing means operated by said controller. I In testimony whereof I have hereunto set my hand, at San Diego, California, this 21st day of October, 1904.

CHARLES W. JACKSON. In presence of RosooE HOWARD, GEO. F. MAHLER.

cage, a motor carried by said false bottom i and reversing and controlling means for said driving means.

2. In an elevator, the combination of a l 

